I Prefer That You WaitDiscrete Mathematics Level 5
Alice and Betty agree to meet tomorrow between 12:00 and 13:00. Alice will arrive uniformly at random during this period, and will wait for 15 minutes or 13:00, whichever comes first. Betty is more patient, and will wait for 20 minutes or 13:00, whichever comes first.
Note.- Alice and Betty's arrival times are independent of each other,